... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

We report MIPS photometry of 20 radio-loud quasars and galaxies at 24 and 70 ЮМm (and of five at 160 ЮМm). We combine this sample with additional sources detected in the far-infrared by IRAS and ISO for a total of 47 objects, including 23 steep-spectrum type I AGNs: radio-loud quasars and broad-line radio galaxies; and 24 type II AGNs: narrow-line and weak-line FR II radio galaxies. ... Thus, the measurements at these wavelengths can be used to test the orientation-dependent unification model. ...

... There are several explanations for these X--ray quiet PMS stars. To examine the explanations, it is proper to divide the PMS stars into three groups: those bluer than R - I = 0.7, those redder than the X--ray sources (R - I > 1.25) and those with colors similar to the X--ray sources. ... A total of 26 of the non--X--ray detected PMS candidates had spectra taken. ... Between V=14 and V=16, I find 25 stars which are X--ray sources and estimate 19 non--X--ray PMS stars. ...

... Dark Belt Reappearing on Jupiter . ... 29.11.2010 . ... North), USC Philippines Explanation: Why are planet-circling clouds disappearing and reappearing on Jupiter? ... Pictured above two weeks ago, far infrared images -- depicted in false-color red -- show a powerful storm system active above the returning dark belt. ... November 2010 . ... 2009 2010 . ... Publications with keywords: Jupiter - clouds - storm - infrared . Publications with words: Jupiter - clouds - storm - infrared . ...

Planetary nebulae are the remnants of low-to-middle mass stars. ... These so-called post-AGB stars are in an intermediate stage of evolution between the AGB and planetary nebulae. ... By studying the post-AGB stars we may be able to determine what causes the complicated structures seen in some planetary nebulae. To investigate this question, we have selected a well-defined sample of 86 post-AGB stars from a previous study of OH 1612-MHz maser sources in the Galactic plane (Sevenster et al., ...

... 2010 November 29 . Dark Belt Reappearing on Jupiter . Credit: NASA's JPL , U. Oxford , UC Berkeley , Gemini Obs. ... Explanation: Why are planet-circling clouds disappearing and reappearing on Jupiter? ... Earlier this year, unexpectedly, Jupiter's dark Southern Equatorial Belt (SEB) disappeared. ... Detailed professional observations revealed that high-flying light-colored ammonia -based clouds formed over the planet-circling dark belt. ... About APOD | ... A service of: ASD at NASA / GSFC . ...

To appear in "Fourth Workshop on Robotic Autonomous Observatories (2015)"RevMexAA(SC) METEOR OBSERVATIONS WITH MINI-MEGATORTORA WIDE-FIELD MONITORING SYSTEM S. Karpov, 1, 3 N. Orekhova2 G. Beskin, 1, 3 A. Biryukov3,4 S. Bondar,2 E. Ivanov,2 E. Katkova,2 A. Perkov, and V. Sasyuk3 RESUMEN 2 Favor de prop orcionar un resumen en espanol. ... The faintest detected meteors has the peak brightness about 10 mag, while the ma jority - from 4 to 8 mag. ... 2010; Karpov et al. 2013; Beskin et al. ...

Next: The main observational parameters Up: Spectral survey of Case Previous: CCD observations and data . ... We divided the presentation of the observed galaxies into the two main groups. In Tables 2 and 3 we give some general parameters, line intensities and equivalent widths for 142 galaxies with the detected emission lines. We summarize data in Table 4 for the rest 44 galaxies where we have not detected emission lines (in the blue part of the spectrum). ... Quasar CG 273 . ...

Spatially Resolved MidIR Observations of the Disk Surrounding Par 21 Mario van den Ancker 1 1 European Southern Observatory, KarlSchwarzschildStrasse 2, D85748 Garching bei MЭnchen, Germany 1. Introduction The small group of YSOs known as FU Orionis stars provide striking evidence for the importance and irregularity of disk accretion during early stellar evolution. ... Fig. ... Par 21 is clearly resolved into an elongated structure with a size of a few hundred AU (Figs. ...

... Here some data observed on the 6m telescope with IFP installed in the OLD focal reducer are presented. ... Mkn 3: velocity field . ... NGC 5252: [OIII] image . ... NGC 5252 was observed 23 Feb. 1998 in the [OIII]5007 emission line with CCD TK1024 as detector. ... We observed the ionized gas velocity fields of the spiral galaxies with two purpose. ... Restored velocity field of NGC 157 in the reference frame rotating with the pattern speed overlaid on the Ha image of the galaxy . ... NGC 4100 . ...

... One striking feature is a small source of almost pure H 2 line emission, which is located near one of the compact sources in Orion reported by O'Dell and collaborators (HST-18 = 203-504). ... H-H objects, Proplyds, Orion Bar, H 2 . ... We obtained a series of images across the bright rim of the Orion Bar near the peaks of mm-wave molecular line emission with NICMOS cameras 1-3 (NIC1, NIC2, NIC3) in several filters on 1998 February 18. ... The suggestion of an H-H object does not seem compelling. ...

... SS433 is a close binary system, one star is a supergiant, a second one is a black hole. ... Even a black hole cannot accept such an enormous mass flux, a supercritical accretion disk appears, all the excess gas glows up to several tens of thousands degrees and is ejected off the disk with enormous velocities. ... SAO researchers have found an evidence of the supercritical accretion onto a black hole in SS433, which follows from a brightness variability of the SS433 disk. ...

These are very prominent absorption lines is most all galaxies. ... These pair of absorption lines will appear in all the spectra and they should be your principle source for determining the redshift. ... When this applet opens you will see an iconic representation of galaxies in the left hand side of the applet and a target area in the right side of the applet. ... Note: What you are doing in this excercise is identical to what Hubble did in the 1920's and you are using the same galaxies. ...

... 8, ``Celestial Mechanics'', 2002 Regularity and chaos for planetary orbits in binaries D. Benest Observatoire de Nice, Nice, France 1. ... Previous papers showed that stable planetary orbits, around either the lightest or the heaviest component of several nearby binary systems, exist up to distances from their primary of the order of more than half the binary's periastron sep­ aration. ... Chaos: bounded or sticky? It is now well­known that planetary dynamics may include some proportion of chaos. ...

A team of U.S. and German astrophysicists have made the first ever detection of X-rays coming from a comet. ... Following the initial detection, the team reported repeated X-ray emissions from the comet over the next 24 hours. ... One preliminary theory is that X-ray emission from the Sun was absorbed by a cloud of gaseous water molecules surrounding the nucleus of the comet, and then were re-emitted by the molecules in a process physicists call "fluorescence." ... Comets . ...

Hot subdwarfs are hots stars with masses somewhat less than that of the Sun. ... They are known as sdB stars because their spectra are dominated by hydrogen lines. ... Normally, a red giant will switch on core helium burning without losingthe layers of hydrogen around the helium core. sdOB stars are related to sdB stars, possibly being the sdB stars which have completed core helium burning and are evolving to become white dwarfs. ... Such stars are known as PG1159 stars and DO white dwarfs. ...

Low energy noise on the MOS CCDs C M Huber t Chen, CEA Saclay 31- 3-2009 - A.k.a. the MOS2CCD5 effect (Stuhlinger 2008) or `anomalous states' (Kuntz and Snowden 2008). ... Low energy noise on the MOS CCDs ­ p. 4/1 Noise has correlation in ODF E1,E2 ! ... Pattern-0 spectrum: - Low energy noise on the MOS CCDs ­ p. 6/1 Correlation is different in different CCDs MOS 1 CCD 4 MOS 1 CCD 5 MOS 2 CCD 2 MOS 2 CCD 5 Low energy noise on the MOS CCDs ­ p. 7/1 Application: Are the central CCDs noisy? ...

... Meade Series 4000 Nebular Filters incorporate the very latest in interference coatings technology. ... Technical Basis of the Meade Broadband Nebular Filter: As shown in the transmission graph below, the Meade Broadband Nebular Filter strongly rejects the light of sodium- and mercury-vapor lights as well as natural airglow and auroral emissions. ... Meade Series 4000 Narrowband Nebular Filters . ... Meade Series 4000 Oxygen-III Nebular Filters . ... Meade Series 4000 Photo-Visual Color Filters . ...

... Return to Dopita's Home Page . Paper presented at: 2me. ... Nebular densities derived from O IV] and Si III] emission line ratios are found to be larger than densities derived from the visible [O II] or [S II] ratios, indicating that the regions nearest the star are denser. ... From a set of line diagnostic diagrams, we find that LINER galaxies, narrow line radio galaxies and cooling flow emission regions can be modelled in terms of fast shocks in a relatively gas poor environment. ...

Hubble Observations Shed New Light on Jupiter Collision . Was it a comet or an asteroid? ... Their initial findings, combined with results from other space-borne and ground-based telescopes, shed new light on Jupiter's atmospheric winds, its immense magnetic field, the mysterious dark debris from the impacts, and the composition of the doomed comet itself. ... Hubble's ultraviolet observations show the motion of very fine impact debris particles now suspended high in Jupiter's atmosphere. ...